Punch press



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G.' TOLLEFSON PUNCH PRES S Filed July 23. 1925 4 Sheets-Sheet l wwfamaai i im t Oct. 19 1926.

G. TOLLEFSON PUNCH PRESS Filed July 23, 1925 4 Sheets-Sheet 3 f @wwf @eni@ 9 1926 G. TOLLEFSON PUNCH PRESS Filed July 25, 1925 4 Sheets-Sheet( 4[ijmz @Mix/@f W15/@fran iff.

limit Eh Patented Oct. 19, 1926.

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Application filed July 23, 19,25.

My present invention has for its object to provide a highly eflicientpunch press, and to this end it consists of the novel devices andcombinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrates the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 isa front elevation of the punchy press;

Fig. 2 is a rear elevation of the same;

Fig. 3 is a view partly in left-side elevation and partly in verticalsection taken on the irregular line 3- -3 of Fig. 1;

Fig. 4 is a fragmentary view partly in plan and partly in horizontalsection taken on the line 4 4 of Fig. 1, on an enlarged scale; v

Fig. 5 is a fragmentary detail view prin.- cipally in section taken onthe line 5-.-,5 of Fig. 1, on an enlarged scale;

Fig. 6 is a fragmentary det-ail view i'n section taken on the line G--Gof Fig. 1, on an enlarged scale;

Fig. 7 is a vertical section taken on the line 7-7 of Fig. 6;

Fig. 8 is a perspective view of the gig shown in Fig. 4;

Fig. 9 is a fragmentary plan view showing the inner end portion of thestop illustrated in Fig. 5; and

Fig. 10 is a transverse section taken on the line 10-10 of Fig. 9.

The numeral 11 indicates a pair of laterally spaced upright frame barsrigidly con nected by a top cross tie bar 12 and a bottom cross tie bar13 and which bars are supported on rigidly secured heavy floor beams 14.A bed 15 in the form of a heavy horizontal beam extends between theframe bars 11 and is rigidly secured thereto at its ends. This bed 15 isfurther supported on a yokelike brace 16 the legs of which diverge andare bolted to the frame bars 11 and supported on the bottom cross tiebar 13.

In the top of the bed 15 is a'plurality of seats 17 which extendcompletely through said beam transversely thereof and in each thereof isremovably mounted a plate 18 having a die seat 19.l These plates 18having dove-tailed interlocking engagement with the bed 15 and are heldagainstendwise removal in their seats 17 by a pair of horizontalen?Serial No. 45,590.

gle bars 20 bolted to opposite faces of the bed 15. Escape passageways21 are formed in the bed 15 under the seats 17 for the escape ofmaterial punched through said seats.

A cross head 22 in the form of a heavy beam is mounted for parallelraising and lowering` movements over the bed 15, and is guided for suchmovements by pairs of laterally spaced upright angle bars 23 bolted tothe inner faces of the frame bars 11. These angle bars or guides 23extend below the beam 15 and the rear angle bars 23 have horizontalslots 24 for the bolts which secure the same to the frame bars 11,whereby they may be adjusted to take up wear on the crosshead 22 andsecurely hold the same against lateral movement.

A plurality of hole-punching dies 25 are removably secured to theerosshead 22 for co-operation with the die seats 19. These dies 25 havecylindrical bodies of the same diameters and are mounted in correspond-`ingly formed seats in the under side of the crosshead 22 and detachablyheld therein by set screws 26. lt will thus be seen that different sizeddies 25 may be interchangeably mounted in the seats in the crosshead 22,and it may be here stated that the plates 18 are all of the same widthso that they may be interchangeably mounted in the seats 17.

To Lcause the `crosshead 22 to freely move vertically between the framebars 11, the ends thereof are recessed at 27 to afford cages in whichare mounted a multiplicity of vertically spaced rollers 28 which havedirect contact with track bars 29 at the inner faces of the frame bars11. These track bars 29 have laterally projecting end portions 30.slidably mounted in seats formed in the frame bars 11 and support saidtrack bars 29 for adjustment toward and from the rollers 28. Pairs ofset screws 31 have screw-threaded engagement with the frame bars 11 andimpinge against the track bars 29 to hold and adjust said track bars 29in their proper relation to the roller 28 and to take up wear.

For raising andl lowering the crosshead 22 to operate the punches 25 orother tools, as will presently appear, there is journaled in bearings onthe 'frame bars 11 a heavy here izontal shaft 32 having a pair ofeccentrics 33 to whiehis applied eccentric straps 34 bolted to theupper. ends of a pair .of up,-

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right connecting rods 35, the lower ends of which are connected to saidcrosshead by hinge-acting joints 36.

The following connections are provided for driving the shaft 32:

A pulley 37 over which runs a driving belt, not shown, is keyed to oneend of a shaft 38 journaled in bearings on the frame bars 11 below theshaft 32, and keyed to the other end of said shaft 33 is a smallsprocket wheel 39. A sprocket chain 40 runs over the sprocket wheel 39,and a large sprocket wheel 41 loosely journaled on one end of acountershaft- 42 journaled in bearings on the top cross tie bar 12. Onthe other end of the countershaft 42 is a spur pinion 43 which mesheswith a spur gear 44 keyed to the shaft 32. rhe sprocket wheel 41 isconnected to the countershaft 42, at will, by'a clutch 45 one member ofwhich is formed with a collar 4G secured to said shaft, and the othermember of which is formed with the hub of said sprocket wheel.

The following connections are provided for sliding` the sprocket wheel41 axially on the countershaft 42 to set or release the clutch 45:

A bar 47 is mounted for horizontal sliding movement in bearings 48 onone of the frame bars 11 and is provided at its outer ends with anopstanding arm 49 having a .shipper fork,'the prongs of which extendinto an annular groove 50 in the hub of the sprocket wheel 41.

A bell crank 51 is pivoted to a bearing on one of the frame bars 11, andhas one of its arms connected to the bar 47 by a notch and pinconnection 52 and its other arm is connected to the upper end of a longconnecting rod 53. llhe lower end of the con` necting rod 47 is attachedto an arm extension 54 on one of the arms of a U-shaped foot treadle 55pivoted to the frame bars 11 with its tranverse portion extendingforward thereof.

A longcoiled spring 55 anchored to one of the frame bars 11 is attachedto the intermediate portion of the connecting rod 53 and under strain tomove the bell crank 51, arm 49 and sprocket wheel 41 into positions torelease the clutch 45.

A stop 57 is mounted on the front angle bar 20 for adjustmentlongitudinally there` of to be positioned in front of any one of the dieseats 19. This stop 57 is adjust-ably secured to the front angle bar 20by a thumb nut-equipped bolt 58 that extends through said stop and alongitudinal slot 59 in said angle bar.

A guide 60 is mounted on the rear angle bar 2O for adjustmentlongitudinally thereof and extends forward over the bed 15 forpositioning a piece of work in respect to any one of the die seats 19.This guide 60 reoaeee is adjust-ably secured to the rear angle bar 2O bya thumb nut-equipped bolt 61 that extends through said guide and alongitudinal slot 62 in the rear angle bar frame.

Various different gigs may be provided for holding` work to be operatedon by the punch press, and in Figs. 4 and 8 one form of gig isillustrated which comprises a jointed bar 63 the sections of which havetheir inner ends overlapped and connected by a thumb nut-equipped bolt64. The outer end of the inner section of the bar (i3 is downwardlyoffset to receive the horizontal flange of the rear angle bar 20, andwhich section is detachably secured to said angle bar by a bolt 55 whichextends through the slot 62 and thereby detachably secures the bar 63 tothe bar 2O with freedom for adjustment opposite any one of the die seats19. rEhe outer section of the bar 53 has on its outer end an outturnedstop lug G6, and on its inner end an upstanding pin 67 adapted to extendthrough a hole in a link or other piece of work for positioning the samea predetermined distance from one of the die seats 19 before punching ahole therein.

(Eo-operating shearing blades G8 are secured, one to the outer face ofthe bed 15 and the other to the outer face of the orosshead 22. To cut apiece of work by the shearing blades 68, a horizontally disposed rod 69is secured to the bed '15 by having` one of its ends screwed into theback thereof, and on the other end is a work-engaging stop 70.

rThis rod 69, near the bed 15, has a joint 71 which permits the longouter section of said rod to be turned down into an inoperative positionwhere the same is out of the way. To hold the outer section of the rod69 in an operative or horizontal position, there is secured thereto aspring clip 72 adapted to 1nterlock with the short section of said rod,as shown in Fig. 9.

To prevent a loose piece of material cut by the shearing blades 68 fromiiying there is Y secured to one of the frame bars 11 a guard 73 thatprojects in front of the movable shearing blades 68 and above the work.

What lr. claim is:

1. The combination with av frame, of a bed on the frame, a crossheadmounted on the frame for raising and lowering movements over the bed,means for operating the crosshead, co-operatingtool elements carried bythe bed and crosshead, the tool elel ments on the bed being in the formof plates removably mounted in seats in the bed by endwise slidingmovement, and a pair of angle bars secured to the bed and holding saidplates against endwise sliding movement, at least one of said angle barsbeing removable form the bed.

2. The structure defined in claim 1 in further combination with a stopadjustably mounted on one of the angle bars, and a guide adjustablymounted on the other of said angle bars.

3. The structure defined in claim l in further combination With a gigattached to one of the. angle bars.

4. The combination With a frame, of a bed on the frame, a crossheadmounted on the frame for raising and lowering movements over the bed,means for operating the crosshead, co-operating tool elements carried bythe bed and crosshead, the tool elements on the bed being in the form ofplates removably mounted in seats in the bed by endWise slidingmovement, a horizontally disposed rod having one of the ends attached tothe bed and having on its other end a Workpositioning stop, said rodhaving a hinge joint, permitting the outer section of said rod to bemoved into an inoperative position, and a clip for holding the outersection of the rod in an operative position.

5. The combination with a frame, of a bed on the frame, a crossheadmounted on the frame over the bed for raising and lowering movements, ashaft journaled on the frame7 eccentrics on the shaft, and havingeccentric straps, rods connecting the crosshead to the eccentric straps,means for driving the shaft, including a clutch, yielding means understrain to release the clutch, connections including a treadle forsetting the clutch, cooperating tool elements on the bed and crosshead,anti-friction rollers mounted in seats inthe ends of the crosshead, andadjustable track bars on the frame for the rollers.

6. The combination with a frame, of a bed on the frame, a crossheadmounted on the frame over the bed for raising and lowering movements, ashaft journaled on the frame, eccentrics on the shaft, and havingeccentric straps, rods connecting the crosshead to the eccentric straps,means for driving the shaft, including a clutch, yielding means understrain torelease the clutch, connections including a treadle for settingthe clutch, cto-operating tool elements on the bed and crosshead,anti-friction rollers mounted in seats in the ends of the crosshead,track bars for the rollers, having laterally projecting ends slidablymounted in seats in the frame, and set screws for adjusting the trackbars in respect to the rollers.

In testimony whereof I afIiX my signature.

GILBERT TOLLEFSON.

